[Ensam]

I don't think this calls for any action on your part. As was noted above all you really know is that your boss mentioned you in some context to your in laws. Let it be a general cautionary tale on the dangers of talking about people (positively or negatively) behind their backs. Word will likely get back to them and it's out of your hands how it will be interpreted by the time it gets to them. You should also be more careful about what you tell people you work with.